# cosc

cosc(x)

Compute $\cos(\pi x) / x - \sin(\pi x) / (\pi x^2)$ if $x \neq 0$, and $0$ if $x = 0$. This is the derivative of sinc(x).

## Examples

1. Calculate the value of cosc(x):

julia> cosc(0.5)
0.43060612817638346

This example calculates the value of cosc(0.5).

2. Compute cosc(x) for an array of values:

julia> x = [0.1, 0.2, 0.3];
julia> cosc.(x)
3-element Array{Float64,1}:
3.062140737012792
1.8523159768093945
1.2877171461718348

It computes the values of cosc(x) for each element in the array x.

3. Handle special case when x = 0:
julia> cosc(0)
0.0

When x is zero, the cosc function returns zero.

Common mistake example:

julia> cosc("hello")
ERROR: MethodError: no method matching cosc(::String)

In this example, the input to the cosc function is a string instead of a numeric value. Make sure to provide valid numeric inputs to the cosc function to avoid such errors.

## See Also

acos, acosd, acosh, acot, acotd, acoth, acsc, acscd, acsch, asec, asecd, asech, asin, asind, asinh, atan, atan2, atand, atanh, cos, cosc, cosd, cosh, cospi, cot, cotd, coth, csc, cscd, csch, deg2rad, rad2deg, sin, sinc, sind, sinh, sinpi, tan, tand, tanh,

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